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Probably 99% of boilers (hot water systems) are cast iron, with the exception of on demand types). Probably 99% of furnaces (hot air systems) are stainless due to cost and weight, stainless will resist the acids caused by combustion.

2007-01-17 23:27:43 · answer #1 · answered by wilson 2 · 1 0

Cast iron.

2007-01-17 23:27:02 · answer #2 · answered by regerugged 7 · 1 0

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